PEB 24911 H V1.3 Lantiq, PEB 24911 H V1.3 Datasheet - Page 74

• Manufacturer Part Number: PEB 24911 H V1.3
• Manufacturer: Lantiq

Specifications of PEB 24911 H V1.3

• Lead Free Status / Rohs Status: Supplier Unconfirmed

PEF 24911
Functional Description
3.16.3
LT-States
This section describes the functions of all states defined in LT-mode.
Alerting
The wake-up signal TL is transmitted for 3 ms (T2) in response to an activation request
from the LT side (AR or ARL). In the case of an analog loop-back, the signal TL is
forwarded internally to the wake-up signal detector and stored.
Alerting Error
When timer T1 (15 s) is expired in state "Alerting" before TN has been detected then the
DFE-Q transits from state "Alerting" to state "Alerting Error". Once "Alerting Error" has
been entered the receiver must be reset by C/I RES1.
Awake
The “Awake” state is entered upon the receipt of a wake-up or an acknowledge signal
TN from the NT. In the case of an activation started by the LT-side, timer T1 is restarted
when the “Awake” state is entered.
Awake Error
The “Awake Error” state is equivalent to the “Awake” state, but is entered only when a
wake-up signal is received while being in the “Receive reset” state. As the “Receive
reset” state was entered upon the application of the C/I-channel code RES1, the “Awake
error” state assures that a minimum amount of time elapses between the application of
the RES1-code and the U-transceiver entering a state (EQ training) in which it again
reacts on the RES1-code. The LT-side is requested to stop issuing the command RES1
within T9 after the receipt of the C/I-channel code AR on DOUT and to replace it by
another command such as the idle code DC for instance.
Deactivated (Full Reset)
In the “Deactivated” state the device may enter the low power consumption condition.
The power-down mode is entered if no monitor messages are to be expected. In power-
down the receiver and parts of the interface are deactivated while functions related to the
®
IOM
-2-interface and the wake-up detector are still active.
No signal is sent on the U-interface, the differential outputs AOUT and BOUT are set to
0 V. The U-transceiver waits for a wake-up signal TN from the NT-side or an activation
request (AR, AR0, UAR or ARL) from the LT-side to start an activation procedure. Note
that in state "Deactivated" no activation can be initiated by AR, ARX, AR0 or UAR if a TN
tone has been recognized before. This situation can be only resolved by applying DC.
Therefore it is recommended to apply always DC before AR, ARX, AR0 or UAR.
For the recognition of the wake-up signal TN the following procedure applies:
Data Sheet
64
2001-07-16